How to check if value id null or undefined. simple way is just check if has value! Like if(value) { // ... } will return true if value is not: null, undefined, NaN, empty string (""), 0, false It’s fulfill our requirements but also check additional conditions Like we want to check id is null or undefined but in response we got id = 0 In this condition it will fail because we just need to check null or undefined if(value !== undefined || value !== null){ // ... }
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